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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb5cb7e7455fd8ce3e6b3aaf3c89eea44ca78071f9d59487110e9aa6d30fbb8' 
  AND token = 'a0ZSkl2P39ho2YGfTroMecAfoW0oqtoR7pXLEca1C6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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