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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a064271e21ea1cfef99e4a5a51539adf0edb66227f7930ae103e36b4a0f14b' 
  AND token = 'vYo9GpS3sqtZFR67esdivV3kt/0hJjgC82FDmOC6HrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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