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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2819e8886686866e8c32ed1339011827f27755c65ea7d06c64d412bcfc807f8a' 
  AND token = 'NtsV4Pi5nay+evRKinUfS1PsfM4LUDY3uEgpnE6KF+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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