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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4610c3adf7a993b94ac3dd367d278935ec73cb5dc1b0dd997fed3ba739eec76d' 
  AND token = '5zyBroO9bQFlvlEjHdgSxa9zyoql3pz3ucpEAHSK2v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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