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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b91415eeecaf2cf6598134d07db0cc738239b9baf5fdabd1d096d1c50493f95' 
  AND token = 'qSpuR6h9JzKUYj7dBCcs8b4si/N2CYWr0DLCcpuA5WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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