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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79ea1dd13a7259459890708d36555c16ced4fbb74511d73e53093ad5d33d476' 
  AND token = 'cRTjE8o2QTyYhMlesAbH964oDacVM/2RLzpETKlfRQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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