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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8bb1b3d7d26d4b72d1e108ae9215aa1c177c58cbc56f0517864b62c8550e24' 
  AND token = 'Bn0dabSrgBlM7+1vYy9IyfQNT3rnoBfuDOJGIQyjte4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}