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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3af8d29037ce2e99c5e94cc21fe1a8c0de58e8b6503324c62da030f5895e5f9' 
  AND token = '7YXMDkKumBbX5SnnVGWu2bRSqWJQZLN0tECAbjulzlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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