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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20a772161f2d6336140638cd16040d8732f26e2c2356d8d19190ab5db990bfb' 
  AND token = 'Uwn19/tvKCCJtEI52H2VGZhSrHOidsFjkw3o/SC+afc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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