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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4515096e61ded91da8539b2f3498dbb69d3add54fa89b2f7ba591c1cfce9fdca' 
  AND token = 'qir3CZSNsyiruqUWIHyiosKUovyqNimo+5O9TVtGpM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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