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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72ad06c5b9b021d46a993d3ab9adaa2478b925d813687f02e3c876cf1bc147a' 
  AND token = 'o1pZWwDAzM/N/Dtsjilb1msAzw7oGrDX8wT6tkjaDTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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