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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab6ca8b45aa0a03b62e6e0e0601fe21d4049793a34cb5064f54f939845f731b' 
  AND token = '2IWgGhpSYCGTamjSboygrya+XKQ04oNhZ0N1H6z0R9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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