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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70994bbcdf460bb676e19872e0f17af58da066816e02048c6404f52f4fe47b69' 
  AND token = 'iU79AHLL2oRQ2NV175pyHrsKNCJHZysy92mvesf11TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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