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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54504cbb460cd92ac3d9bf32407d8f7198a7f6d1f37f23389c2fa9c4d85fd5f9' 
  AND token = 'kIwgijC73mxPUZfo9djcZnw8OXDHP2x5Pk+uAp5h450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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