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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e760fd4ac902ba2750806e67590c077b4318e4d6b8e244efcb19b61bb1ea36' 
  AND token = 'geZdRJyrPfn3ss+BhgRaS+3AseM638wFydSpXqjx6dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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