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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1930cca2706d189c518b00c3b23ae09301864cf8c22f3ba6d3e31d5a6a811762' 
  AND token = 'q271LaF0TnLtkJx4lHCE+MUY+1NCMa73W7d9nGqIfy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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