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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9020a372713e84a78e527b2b14c868e6d9e9a18b758dc6fcd7973cfb65d474fe' 
  AND token = 'GYQ+GAfxO+9B3Ja11ezJr/O4s/M1V1AVFeRAtSP7RXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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