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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c45136faf5640d251a30d79b6f39aa6ce705a7db1c729d1d66d288982a7b81a' 
  AND token = 'ClXpL2OQW04gwD3pJZF8IeBIQRRCJEvV3fR3IPxErcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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