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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815ae147796c3848e4d4f254e8f5573f90c78a406aeb5fc4c3138aed986515d5' 
  AND token = 'MecwGl6AIjEN5Qo+28nMXkjVKLK0sSXfnR8+pfycxLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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