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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f4b9b167d956a31de02b57ea0c713f85012ff7d7e202333a0815591746bc67' 
  AND token = '4zEyzM7W/P4wtsLllieI2tGBwFavVnkmp2Rei20YRtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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