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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741445cce2a14ba95b4236cfbf50c6dee997297dca1a3fbc23ca33d15e7e483d' 
  AND token = 'ClN0557645md3ukFkFXle9OM1UcZ3JWiMXo9tXa5FYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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