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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc178b1fdb8dc047312547cfe0f9d2814cc15bb3632bb0b51fe6a3294a0e8696' 
  AND token = 'saEItf78c2koPeT1ChyzfNC5OCjBnX3/vkLHadn0VUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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