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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed5b58e6a38427514186749ca73d4770eea44ccb23c17082f5d7d1dfb019ae6' 
  AND token = 'asUBwAAs0wVQiR8Q1ExCnrvW2CxEPWxevpz7WoFbOvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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