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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c97109685f2a557fac1c70cd7c78f7bd43873e078a598df7f9f262945551e79' 
  AND token = 'KV+gMYuMz3jPn7b1lcW4Q1Tfu97nTfQIe8IdFKgnVAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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