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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2109dd9ac499456ed6827e5019b19b6d2132d5806bcab992c362e1877162256e' 
  AND token = 'qlN2g/PB4F247yJZLYNrvm0SS5iVYwnEsJAO7gHrAHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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