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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb911b524d8a16f38fa9e3ec7c0194cc78ee1c02977e1207cda53fffe5f506bb' 
  AND token = '06g5TO3cpXjF70g0j9GtDeYn6j+LNqCd6cQPnoD2tkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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