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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96049f3efa6796e47166a4a4ab59c068fb71eb09b389b98c721673362d7c8d7' 
  AND token = 'Xij2DcKC9dvGi+yF4XhvrQHvHEyl2iKW/FFTWfvRb6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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