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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1134dbada7a87fab2ac11cf88ce7d4fd81e6b1ab380fc9d53fccb83ff5673b00' 
  AND token = 'eZ2wvmUsIh35f6x9GoRXY8y/l0Wk29Vw7xYnEyrPB3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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