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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f748ab98ac8141955bcac08732e2ee4227b28c5280195f74ed3be5f8905c35' 
  AND token = 'VDpc6bG1y0yEsoyaxx4+6RLyKlic1PCyn79KJUeiXKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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