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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b2b59c53e51f3810575a82d2c3005764bbcb27da056180fb4cdb109d6aeef3' 
  AND token = 'aieuit8dlxvYs1UHE787onOrjFf17aIx4nP5mkk19WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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