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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f616d8b259ba227d7a43a8e0e75af2477ef0c8766631bb87ba2724fac475bf' 
  AND token = 'VR03KYkpqYVEOsbtEQpD3TK/3rOvbVda363ZcslrMrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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