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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c9b5b1e62b5494cd99bddea0ff532579ee52d9a34d282c3e6707e52f081597' 
  AND token = 'pO+O91wCMoMnXkks4D1bKohMfEZ/OiC1H2M8ZLrey/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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