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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe87e5219b71bf6da6e5d647edc10e3383ef6b9062c2547ce2e3e925dd4ef35a' 
  AND token = 'qZg+lJhFS4Rq/cCp5MCb3orL9N7jT7so3VGz6ZIisHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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