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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98d5518b07cfab8e0e19d8f14b5c1c8c2cca877727b71f8af9ac9e8012918a3' 
  AND token = '5rkusyDcB7GZE2cg+SYfGRi7Rjm+7D3RpOvp3+ian/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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