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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3a4ea4bceb33e4352e2ec5e81baa23c7d56a1259001fe864e5e65d39849fee' 
  AND token = 'Mc7z9+dVA6StFp8twy9Ew1aO26ljuqbndUtFQmvnC/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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