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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c3a49b5e7ecade5ece363ffc1000aa7190b27a86fc6006058f8aa74bb207ff' 
  AND token = 'W1eTlowH8oO20WXXgA44vP7Lm1ZMWhW+66o0gpRPWeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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