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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd159b03997c9a87267e13fd0dfa6f9de8a326c74b460cb921ffc3fa34c88a399' 
  AND token = '2RSVV9GH6N15ejm4qmegmJPM7G32hN5oPORRcvrQM2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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