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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5298e30b75deb1d5103f51bec9951777f3a36e9ad98b743678522d30852ac1' 
  AND token = 'goSwTmr0FncX9OLy6m7PmqANJdHNF4h1C/glEZCnajY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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