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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f40caf1d3d1cdce5b9ff37b649b14e1aedb85d2bb1fad594af9f74eff5b234b' 
  AND token = 'jkcv2HfVl3O/MmYaBFe0CtGI58JOB8Q1JKOWQYgx8EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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