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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a62dafa2b62b2b318fe0f38871874b3c460e937906e7d3bb8192b25bf727be' 
  AND token = 'WG/HfYMkfGeCqyALQjoyP6ZT6YQ7khxwu76b6xYUUA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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