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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb17e12777523d455ee0b9093d32a88ffe0e3d27eb7c30892d09c2255be35532' 
  AND token = 'xHtgYVPjmCMC6XRD6HMi4gZYdmDp8KzkJ6mJ1sElymU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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