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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996f95bbf382723a1b1833d114df2152cc442f6ed942c36afa6d8caaac04d0e7' 
  AND token = 'UA0kmr7zJs+j3IdyW9Aur3CiwtPxN64efPdbNrA/HvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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