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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd35bcece0294a00bc319530c9a3b59ec45efc76972205875a4d5acf4c7527a' 
  AND token = 'GBbqmpiplt+q2w2Y0cJvAd13XY9ls3vs7aKwn59DcKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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