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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef3b2cbd2ce0cc4e2f0015d5e05a6871f682b460b24a74377ff37aa8a21c459' 
  AND token = 'c0nHbzz5qKQD4J43QtzpB9EiN85ceuC/IgiT/F2cVPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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