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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f08ea871ddf1f975ebc8e31b846f4a9fd9a9166e3618f58a9f0d4df93d2977' 
  AND token = 'G4ga1hAkhu3eQCy5cg50jhifkHKmdULAh+yEs8DMUWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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