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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04942b7b758f7ab4471887d320155ceac90b0e8158011cad96389731d03a2a8' 
  AND token = 'HOG8+Vn5sgPek6QpcYIGb7cEm9kx4K7d0S5hs1Mh8pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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