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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6a2250a69f38e3f6bab163f670be29b9ef48f538699eb9aec0f26f5e6605bd' 
  AND token = '7l2JW0FnEeByNy9x2gvEZ7pBAcs0lB+HwhWc5sBalaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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