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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0bec2ee1fbdd296055bf19da84fd0733155abdc263215150a2f32730eff5b1' 
  AND token = 'xJJ3g6h7OwIkKCTfLbABaeQKRJNpYSB6IZqAs3CHNmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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