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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f70f189e285ba1322c61f8e7e1ccbb08687f186e38fde8e4fa8a6af2f84ba8b' 
  AND token = 'h1Ak+oJqcJ7ZAcmRif8KBJibP9/tAchfZ4diitfG2iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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