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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba4c1747674680c949620d0a4d32337928fba0157516f69988b5d9aaff1e33a' 
  AND token = '7DI6w1yEtBayGPRjZD8ZhB1DcbZ+CsxcRYVGij6Nyqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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