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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e136879331208fecf91a77a03bc3fdcb2e805ded6e2a639ee618db67e65ecaa' 
  AND token = 'iZsq3BD1o1ld24L/UBqefxL7WwS9MsqG9N08mR3IG48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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