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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeebb48c67dac26ae3c9e24c9204c53c88ccb2a7c8efe968ad518503cce2a80f' 
  AND token = 'FYNCkVNchtXI1P4QJ9qXb+DzEfY2+Bw/Aq2PBDUFydc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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