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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c0c00c9877e559415671dcf7f48334ae2f21b724fdf62ec3e0202ecd8c769e' 
  AND token = 'u0BFNGOWkHVyrFsvq9QtXA2ZX10y6YnxC13uMDSyiyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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