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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75530d203c7b77fb08e547cd3c244c57fd477c34c70cca06c9fd4a8192023437' 
  AND token = 'Q/piMBruAQP3j45F6fcKl0W4ub2kIo/pSVTsonjkOaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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